drivers/scsi/scsi_transport_spi.c

   1 /*
   2  *  Parallel SCSI (SPI) transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *  Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #include <linux/ctype.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/blkdev.h>
  26 #include <linux/mutex.h>
  27 #include <scsi/scsi.h>
  28 #include "scsi_priv.h"
  29 #include <scsi/scsi_device.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_cmnd.h>
  32 #include <scsi/scsi_eh.h>
  33 #include <scsi/scsi_transport.h>
  34 #include <scsi/scsi_transport_spi.h>
  35
  36 #define SPI_NUM_ATTRS 14        /* increase this if you add attributes */
  37 #define SPI_OTHER_ATTRS 1       /* Increase this if you add "always
  38                                  * on" attributes */
  39 #define SPI_HOST_ATTRS  1
  40
  41 #define SPI_MAX_ECHO_BUFFER_SIZE        4096
  42
  43 #define DV_LOOPS        3
  44 #define DV_TIMEOUT      (10*HZ)
  45 #define DV_RETRIES      3       /* should only need at most
  46                                  * two cc/ua clears */
  47
  48 /* Private data accessors (keep these out of the header file) */
  49 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
  50 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
  51
  52 struct spi_internal {
  53         struct scsi_transport_template t;
  54         struct spi_function_template *f;
  55         /* The actual attributes */
  56         struct class_device_attribute private_attrs[SPI_NUM_ATTRS];
  57         /* The array of null terminated pointers to attributes
  58          * needed by scsi_sysfs.c */
  59         struct class_device_attribute *attrs[SPI_NUM_ATTRS + SPI_OTHER_ATTRS + 1];
  60         struct class_device_attribute private_host_attrs[SPI_HOST_ATTRS];
  61         struct class_device_attribute *host_attrs[SPI_HOST_ATTRS + 1];
  62 };
  63
  64 #define to_spi_internal(tmpl)   container_of(tmpl, struct spi_internal, t)
  65
  66 static const int ppr_to_ps[] = {
  67         /* The PPR values 0-6 are reserved, fill them in when
  68          * the committee defines them */
  69         -1,                     /* 0x00 */
  70         -1,                     /* 0x01 */
  71         -1,                     /* 0x02 */
  72         -1,                     /* 0x03 */
  73         -1,                     /* 0x04 */
  74         -1,                     /* 0x05 */
  75         -1,                     /* 0x06 */
  76          3125,                  /* 0x07 */
  77          6250,                  /* 0x08 */
  78         12500,                  /* 0x09 */
  79         25000,                  /* 0x0a */
  80         30300,                  /* 0x0b */
  81         50000,                  /* 0x0c */
  82 };
  83 /* The PPR values at which you calculate the period in ns by multiplying
  84  * by 4 */
  85 #define SPI_STATIC_PPR  0x0c
  86
  87 static int sprint_frac(char *dest, int value, int denom)
  88 {
  89         int frac = value % denom;
  90         int result = sprintf(dest, "%d", value / denom);
  91
  92         if (frac == 0)
  93                 return result;
  94         dest[result++] = '.';
  95
  96         do {
  97                 denom /= 10;
  98                 sprintf(dest + result, "%d", frac / denom);
  99                 result++;
 100                 frac %= denom;
 101         } while (frac);
 102
 103         dest[result++] = '\0';
 104         return result;
 105 }
 106
 107 static int spi_execute(struct scsi_device *sdev, const void *cmd,
 108                        enum dma_data_direction dir,
 109                        void *buffer, unsigned bufflen,
 110                        struct scsi_sense_hdr *sshdr)
 111 {
 112         int i, result;
 113         unsigned char sense[SCSI_SENSE_BUFFERSIZE];
 114
 115         for(i = 0; i < DV_RETRIES; i++) {
 116                 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
 117                                       sense, DV_TIMEOUT, /* retries */ 1,
 118                                       REQ_FAILFAST);
 119                 if (result & DRIVER_SENSE) {
 120                         struct scsi_sense_hdr sshdr_tmp;
 121                         if (!sshdr)
 122                                 sshdr = &sshdr_tmp;
 123
 124                         if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
 125                                                  sshdr)
 126                             && sshdr->sense_key == UNIT_ATTENTION)
 127                                 continue;
 128                 }
 129                 break;
 130         }
 131         return result;
 132 }
 133
 134 static struct {
 135         enum spi_signal_type    value;
 136         char                    *name;
 137 } signal_types[] = {
 138         { SPI_SIGNAL_UNKNOWN, "unknown" },
 139         { SPI_SIGNAL_SE, "SE" },
 140         { SPI_SIGNAL_LVD, "LVD" },
 141         { SPI_SIGNAL_HVD, "HVD" },
 142 };
 143
 144 static inline const char *spi_signal_to_string(enum spi_signal_type type)
 145 {
 146         int i;
 147
 148         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 149                 if (type == signal_types[i].value)
 150                         return signal_types[i].name;
 151         }
 152         return NULL;
 153 }
 154 static inline enum spi_signal_type spi_signal_to_value(const char *name)
 155 {
 156         int i, len;
 157
 158         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 159                 len =  strlen(signal_types[i].name);
 160                 if (strncmp(name, signal_types[i].name, len) == 0 &&
 161                     (name[len] == '\n' || name[len] == '\0'))
 162                         return signal_types[i].value;
 163         }
 164         return SPI_SIGNAL_UNKNOWN;
 165 }
 166
 167 static int spi_host_setup(struct transport_container *tc, struct device *dev,
 168                           struct class_device *cdev)
 169 {
 170         struct Scsi_Host *shost = dev_to_shost(dev);
 171
 172         spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 173
 174         return 0;
 175 }
 176
 177 static DECLARE_TRANSPORT_CLASS(spi_host_class,
 178                                "spi_host",
 179                                spi_host_setup,
 180                                NULL,
 181                                NULL);
 182
 183 static int spi_host_match(struct attribute_container *cont,
 184                           struct device *dev)
 185 {
 186         struct Scsi_Host *shost;
 187         struct spi_internal *i;
 188
 189         if (!scsi_is_host_device(dev))
 190                 return 0;
 191
 192         shost = dev_to_shost(dev);
 193         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 194             != &spi_host_class.class)
 195                 return 0;
 196
 197         i = to_spi_internal(shost->transportt);
 198
 199         return &i->t.host_attrs.ac == cont;
 200 }
 201
 202 static int spi_device_configure(struct transport_container *tc,
 203                                 struct device *dev,
 204                                 struct class_device *cdev)
 205 {
 206         struct scsi_device *sdev = to_scsi_device(dev);
 207         struct scsi_target *starget = sdev->sdev_target;
 208
 209         /* Populate the target capability fields with the values
 210          * gleaned from the device inquiry */
 211
 212         spi_support_sync(starget) = scsi_device_sync(sdev);
 213         spi_support_wide(starget) = scsi_device_wide(sdev);
 214         spi_support_dt(starget) = scsi_device_dt(sdev);
 215         spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
 216         spi_support_ius(starget) = scsi_device_ius(sdev);
 217         spi_support_qas(starget) = scsi_device_qas(sdev);
 218
 219         return 0;
 220 }
 221
 222 static int spi_setup_transport_attrs(struct transport_container *tc,
 223                                      struct device *dev,
 224                                      struct class_device *cdev)
 225 {
 226         struct scsi_target *starget = to_scsi_target(dev);
 227
 228         spi_period(starget) = -1;       /* illegal value */
 229         spi_min_period(starget) = 0;
 230         spi_offset(starget) = 0;        /* async */
 231         spi_max_offset(starget) = 255;
 232         spi_width(starget) = 0; /* narrow */
 233         spi_max_width(starget) = 1;
 234         spi_iu(starget) = 0;    /* no IU */
 235         spi_dt(starget) = 0;    /* ST */
 236         spi_qas(starget) = 0;
 237         spi_wr_flow(starget) = 0;
 238         spi_rd_strm(starget) = 0;
 239         spi_rti(starget) = 0;
 240         spi_pcomp_en(starget) = 0;
 241         spi_hold_mcs(starget) = 0;
 242         spi_dv_pending(starget) = 0;
 243         spi_dv_in_progress(starget) = 0;
 244         spi_initial_dv(starget) = 0;
 245         mutex_init(&spi_dv_mutex(starget));
 246
 247         return 0;
 248 }
 249
 250 #define spi_transport_show_simple(field, format_string)                 \
 251                                                                         \
 252 static ssize_t                                                          \
 253 show_spi_transport_##field(struct class_device *cdev, char *buf)        \
 254 {                                                                       \
 255         struct scsi_target *starget = transport_class_to_starget(cdev); \
 256         struct spi_transport_attrs *tp;                                 \
 257                                                                         \
 258         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 259         return snprintf(buf, 20, format_string, tp->field);             \
 260 }
 261
 262 #define spi_transport_store_simple(field, format_string)                \
 263                                                                         \
 264 static ssize_t                                                          \
 265 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 266                             size_t count)                               \
 267 {                                                                       \
 268         int val;                                                        \
 269         struct scsi_target *starget = transport_class_to_starget(cdev); \
 270         struct spi_transport_attrs *tp;                                 \
 271                                                                         \
 272         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 273         val = simple_strtoul(buf, NULL, 0);                             \
 274         tp->field = val;                                                \
 275         return count;                                                   \
 276 }
 277
 278 #define spi_transport_show_function(field, format_string)               \
 279                                                                         \
 280 static ssize_t                                                          \
 281 show_spi_transport_##field(struct class_device *cdev, char *buf)        \
 282 {                                                                       \
 283         struct scsi_target *starget = transport_class_to_starget(cdev); \
 284         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 285         struct spi_transport_attrs *tp;                                 \
 286         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 287         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 288         if (i->f->get_##field)                                          \
 289                 i->f->get_##field(starget);                             \
 290         return snprintf(buf, 20, format_string, tp->field);             \
 291 }
 292
 293 #define spi_transport_store_function(field, format_string)              \
 294 static ssize_t                                                          \
 295 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 296                             size_t count)                               \
 297 {                                                                       \
 298         int val;                                                        \
 299         struct scsi_target *starget = transport_class_to_starget(cdev); \
 300         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 301         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 302                                                                         \
 303         val = simple_strtoul(buf, NULL, 0);                             \
 304         i->f->set_##field(starget, val);                        \
 305         return count;                                                   \
 306 }
 307
 308 #define spi_transport_store_max(field, format_string)                   \
 309 static ssize_t                                                          \
 310 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 311                             size_t count)                               \
 312 {                                                                       \
 313         int val;                                                        \
 314         struct scsi_target *starget = transport_class_to_starget(cdev); \
 315         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 316         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 317         struct spi_transport_attrs *tp                                  \
 318                 = (struct spi_transport_attrs *)&starget->starget_data; \
 319                                                                         \
 320         val = simple_strtoul(buf, NULL, 0);                             \
 321         if (val > tp->max_##field)                                      \
 322                 val = tp->max_##field;                                  \
 323         i->f->set_##field(starget, val);                                \
 324         return count;                                                   \
 325 }
 326
 327 #define spi_transport_rd_attr(field, format_string)                     \
 328         spi_transport_show_function(field, format_string)               \
 329         spi_transport_store_function(field, format_string)              \
 330 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 331                          show_spi_transport_##field,                    \
 332                          store_spi_transport_##field);
 333
 334 #define spi_transport_simple_attr(field, format_string)                 \
 335         spi_transport_show_simple(field, format_string)                 \
 336         spi_transport_store_simple(field, format_string)                \
 337 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 338                          show_spi_transport_##field,                    \
 339                          store_spi_transport_##field);
 340
 341 #define spi_transport_max_attr(field, format_string)                    \
 342         spi_transport_show_function(field, format_string)               \
 343         spi_transport_store_max(field, format_string)                   \
 344         spi_transport_simple_attr(max_##field, format_string)           \
 345 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 346                          show_spi_transport_##field,                    \
 347                          store_spi_transport_##field);
 348
 349 /* The Parallel SCSI Tranport Attributes: */
 350 spi_transport_max_attr(offset, "%d\n");
 351 spi_transport_max_attr(width, "%d\n");
 352 spi_transport_rd_attr(iu, "%d\n");
 353 spi_transport_rd_attr(dt, "%d\n");
 354 spi_transport_rd_attr(qas, "%d\n");
 355 spi_transport_rd_attr(wr_flow, "%d\n");
 356 spi_transport_rd_attr(rd_strm, "%d\n");
 357 spi_transport_rd_attr(rti, "%d\n");
 358 spi_transport_rd_attr(pcomp_en, "%d\n");
 359 spi_transport_rd_attr(hold_mcs, "%d\n");
 360
 361 /* we only care about the first child device so we return 1 */
 362 static int child_iter(struct device *dev, void *data)
 363 {
 364         struct scsi_device *sdev = to_scsi_device(dev);
 365
 366         spi_dv_device(sdev);
 367         return 1;
 368 }
 369
 370 static ssize_t
 371 store_spi_revalidate(struct class_device *cdev, const char *buf, size_t count)
 372 {
 373         struct scsi_target *starget = transport_class_to_starget(cdev);
 374
 375         device_for_each_child(&starget->dev, NULL, child_iter);
 376         return count;
 377 }
 378 static CLASS_DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
 379
 380 /* Translate the period into ns according to the current spec
 381  * for SDTR/PPR messages */
 382 static int period_to_str(char *buf, int period)
 383 {
 384         int len, picosec;
 385
 386         if (period < 0 || period > 0xff) {
 387                 picosec = -1;
 388         } else if (period <= SPI_STATIC_PPR) {
 389                 picosec = ppr_to_ps[period];
 390         } else {
 391                 picosec = period * 4000;
 392         }
 393
 394         if (picosec == -1) {
 395                 len = sprintf(buf, "reserved");
 396         } else {
 397                 len = sprint_frac(buf, picosec, 1000);
 398         }
 399
 400         return len;
 401 }
 402
 403 static ssize_t
 404 show_spi_transport_period_helper(char *buf, int period)
 405 {
 406         int len = period_to_str(buf, period);
 407         buf[len++] = '\n';
 408         buf[len] = '\0';
 409         return len;
 410 }
 411
 412 static ssize_t
 413 store_spi_transport_period_helper(struct class_device *cdev, const char *buf,
 414                                   size_t count, int *periodp)
 415 {
 416         int j, picosec, period = -1;
 417         char *endp;
 418
 419         picosec = simple_strtoul(buf, &endp, 10) * 1000;
 420         if (*endp == '.') {
 421                 int mult = 100;
 422                 do {
 423                         endp++;
 424                         if (!isdigit(*endp))
 425                                 break;
 426                         picosec += (*endp - '0') * mult;
 427                         mult /= 10;
 428                 } while (mult > 0);
 429         }
 430
 431         for (j = 0; j <= SPI_STATIC_PPR; j++) {
 432                 if (ppr_to_ps[j] < picosec)
 433                         continue;
 434                 period = j;
 435                 break;
 436         }
 437
 438         if (period == -1)
 439                 period = picosec / 4000;
 440
 441         if (period > 0xff)
 442                 period = 0xff;
 443
 444         *periodp = period;
 445
 446         return count;
 447 }
 448
 449 static ssize_t
 450 show_spi_transport_period(struct class_device *cdev, char *buf)
 451 {
 452         struct scsi_target *starget = transport_class_to_starget(cdev);
 453         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 454         struct spi_internal *i = to_spi_internal(shost->transportt);
 455         struct spi_transport_attrs *tp =
 456                 (struct spi_transport_attrs *)&starget->starget_data;
 457
 458         if (i->f->get_period)
 459                 i->f->get_period(starget);
 460
 461         return show_spi_transport_period_helper(buf, tp->period);
 462 }
 463
 464 static ssize_t
 465 store_spi_transport_period(struct class_device *cdev, const char *buf,
 466                             size_t count)
 467 {
 468         struct scsi_target *starget = transport_class_to_starget(cdev);
 469         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 470         struct spi_internal *i = to_spi_internal(shost->transportt);
 471         struct spi_transport_attrs *tp =
 472                 (struct spi_transport_attrs *)&starget->starget_data;
 473         int period, retval;
 474
 475         retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 476
 477         if (period < tp->min_period)
 478                 period = tp->min_period;
 479
 480         i->f->set_period(starget, period);
 481
 482         return retval;
 483 }
 484
 485 static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR,
 486                          show_spi_transport_period,
 487                          store_spi_transport_period);
 488
 489 static ssize_t
 490 show_spi_transport_min_period(struct class_device *cdev, char *buf)
 491 {
 492         struct scsi_target *starget = transport_class_to_starget(cdev);
 493         struct spi_transport_attrs *tp =
 494                 (struct spi_transport_attrs *)&starget->starget_data;
 495
 496         return show_spi_transport_period_helper(buf, tp->min_period);
 497 }
 498
 499 static ssize_t
 500 store_spi_transport_min_period(struct class_device *cdev, const char *buf,
 501                             size_t count)
 502 {
 503         struct scsi_target *starget = transport_class_to_starget(cdev);
 504         struct spi_transport_attrs *tp =
 505                 (struct spi_transport_attrs *)&starget->starget_data;
 506
 507         return store_spi_transport_period_helper(cdev, buf, count,
 508                                                  &tp->min_period);
 509 }
 510
 511
 512 static CLASS_DEVICE_ATTR(min_period, S_IRUGO | S_IWUSR,
 513                          show_spi_transport_min_period,
 514                          store_spi_transport_min_period);
 515
 516
 517 static ssize_t show_spi_host_signalling(struct class_device *cdev, char *buf)
 518 {
 519         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 520         struct spi_internal *i = to_spi_internal(shost->transportt);
 521
 522         if (i->f->get_signalling)
 523                 i->f->get_signalling(shost);
 524
 525         return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
 526 }
 527 static ssize_t store_spi_host_signalling(struct class_device *cdev,
 528                                          const char *buf, size_t count)
 529 {
 530         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 531         struct spi_internal *i = to_spi_internal(shost->transportt);
 532         enum spi_signal_type type = spi_signal_to_value(buf);
 533
 534         if (type != SPI_SIGNAL_UNKNOWN)
 535                 i->f->set_signalling(shost, type);
 536
 537         return count;
 538 }
 539 static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR,
 540                          show_spi_host_signalling,
 541                          store_spi_host_signalling);
 542
 543 #define DV_SET(x, y)                    \
 544         if(i->f->set_##x)               \
 545                 i->f->set_##x(sdev->sdev_target, y)
 546
 547 enum spi_compare_returns {
 548         SPI_COMPARE_SUCCESS,
 549         SPI_COMPARE_FAILURE,
 550         SPI_COMPARE_SKIP_TEST,
 551 };
 552
 553
 554 /* This is for read/write Domain Validation:  If the device supports
 555  * an echo buffer, we do read/write tests to it */
 556 static enum spi_compare_returns
 557 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
 558                           u8 *ptr, const int retries)
 559 {
 560         int len = ptr - buffer;
 561         int j, k, r, result;
 562         unsigned int pattern = 0x0000ffff;
 563         struct scsi_sense_hdr sshdr;
 564
 565         const char spi_write_buffer[] = {
 566                 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 567         };
 568         const char spi_read_buffer[] = {
 569                 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 570         };
 571
 572         /* set up the pattern buffer.  Doesn't matter if we spill
 573          * slightly beyond since that's where the read buffer is */
 574         for (j = 0; j < len; ) {
 575
 576                 /* fill the buffer with counting (test a) */
 577                 for ( ; j < min(len, 32); j++)
 578                         buffer[j] = j;
 579                 k = j;
 580                 /* fill the buffer with alternating words of 0x0 and
 581                  * 0xffff (test b) */
 582                 for ( ; j < min(len, k + 32); j += 2) {
 583                         u16 *word = (u16 *)&buffer[j];
 584
 585                         *word = (j & 0x02) ? 0x0000 : 0xffff;
 586                 }
 587                 k = j;
 588                 /* fill with crosstalk (alternating 0x5555 0xaaa)
 589                  * (test c) */
 590                 for ( ; j < min(len, k + 32); j += 2) {
 591                         u16 *word = (u16 *)&buffer[j];
 592
 593                         *word = (j & 0x02) ? 0x5555 : 0xaaaa;
 594                 }
 595                 k = j;
 596                 /* fill with shifting bits (test d) */
 597                 for ( ; j < min(len, k + 32); j += 4) {
 598                         u32 *word = (unsigned int *)&buffer[j];
 599                         u32 roll = (pattern & 0x80000000) ? 1 : 0;
 600
 601                         *word = pattern;
 602                         pattern = (pattern << 1) | roll;
 603                 }
 604                 /* don't bother with random data (test e) */
 605         }
 606
 607         for (r = 0; r < retries; r++) {
 608                 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
 609                                      buffer, len, &sshdr);
 610                 if(result || !scsi_device_online(sdev)) {
 611
 612                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 613                         if (scsi_sense_valid(&sshdr)
 614                             && sshdr.sense_key == ILLEGAL_REQUEST
 615                             /* INVALID FIELD IN CDB */
 616                             && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
 617                                 /* This would mean that the drive lied
 618                                  * to us about supporting an echo
 619                                  * buffer (unfortunately some Western
 620                                  * Digital drives do precisely this)
 621                                  */
 622                                 return SPI_COMPARE_SKIP_TEST;
 623
 624
 625                         sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
 626                         return SPI_COMPARE_FAILURE;
 627                 }
 628
 629                 memset(ptr, 0, len);
 630                 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
 631                             ptr, len, NULL);
 632                 scsi_device_set_state(sdev, SDEV_QUIESCE);
 633
 634                 if (memcmp(buffer, ptr, len) != 0)
 635                         return SPI_COMPARE_FAILURE;
 636         }
 637         return SPI_COMPARE_SUCCESS;
 638 }
 639
 640 /* This is for the simplest form of Domain Validation: a read test
 641  * on the inquiry data from the device */
 642 static enum spi_compare_returns
 643 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
 644                               u8 *ptr, const int retries)
 645 {
 646         int r, result;
 647         const int len = sdev->inquiry_len;
 648         const char spi_inquiry[] = {
 649                 INQUIRY, 0, 0, 0, len, 0
 650         };
 651
 652         for (r = 0; r < retries; r++) {
 653                 memset(ptr, 0, len);
 654
 655                 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
 656                                      ptr, len, NULL);
 657
 658                 if(result || !scsi_device_online(sdev)) {
 659                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 660                         return SPI_COMPARE_FAILURE;
 661                 }
 662
 663                 /* If we don't have the inquiry data already, the
 664                  * first read gets it */
 665                 if (ptr == buffer) {
 666                         ptr += len;
 667                         --r;
 668                         continue;
 669                 }
 670
 671                 if (memcmp(buffer, ptr, len) != 0)
 672                         /* failure */
 673                         return SPI_COMPARE_FAILURE;
 674         }
 675         return SPI_COMPARE_SUCCESS;
 676 }
 677
 678 static enum spi_compare_returns
 679 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
 680                enum spi_compare_returns
 681                (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
 682 {
 683         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 684         struct scsi_target *starget = sdev->sdev_target;
 685         int period = 0, prevperiod = 0;
 686         enum spi_compare_returns retval;
 687
 688
 689         for (;;) {
 690                 int newperiod;
 691                 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
 692
 693                 if (retval == SPI_COMPARE_SUCCESS
 694                     || retval == SPI_COMPARE_SKIP_TEST)
 695                         break;
 696
 697                 /* OK, retrain, fallback */
 698                 if (i->f->get_iu)
 699                         i->f->get_iu(starget);
 700                 if (i->f->get_qas)
 701                         i->f->get_qas(starget);
 702                 if (i->f->get_period)
 703                         i->f->get_period(sdev->sdev_target);
 704
 705                 /* Here's the fallback sequence; first try turning off
 706                  * IU, then QAS (if we can control them), then finally
 707                  * fall down the periods */
 708                 if (i->f->set_iu && spi_iu(starget)) {
 709                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
 710                         DV_SET(iu, 0);
 711                 } else if (i->f->set_qas && spi_qas(starget)) {
 712                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
 713                         DV_SET(qas, 0);
 714                 } else {
 715                         newperiod = spi_period(starget);
 716                         period = newperiod > period ? newperiod : period;
 717                         if (period < 0x0d)
 718                                 period++;
 719                         else
 720                                 period += period >> 1;
 721
 722                         if (unlikely(period > 0xff || period == prevperiod)) {
 723                                 /* Total failure; set to async and return */
 724                                 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
 725                                 DV_SET(offset, 0);
 726                                 return SPI_COMPARE_FAILURE;
 727                         }
 728                         starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
 729                         DV_SET(period, period);
 730                         prevperiod = period;
 731                 }
 732         }
 733         return retval;
 734 }
 735
 736 static int
 737 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
 738 {
 739         int l, result;
 740
 741         /* first off do a test unit ready.  This can error out
 742          * because of reservations or some other reason.  If it
 743          * fails, the device won't let us write to the echo buffer
 744          * so just return failure */
 745
 746         const char spi_test_unit_ready[] = {
 747                 TEST_UNIT_READY, 0, 0, 0, 0, 0
 748         };
 749
 750         const char spi_read_buffer_descriptor[] = {
 751                 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
 752         };
 753
 754
 755         /* We send a set of three TURs to clear any outstanding
 756          * unit attention conditions if they exist (Otherwise the
 757          * buffer tests won't be happy).  If the TUR still fails
 758          * (reservation conflict, device not ready, etc) just
 759          * skip the write tests */
 760         for (l = 0; ; l++) {
 761                 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
 762                                      NULL, 0, NULL);
 763
 764                 if(result) {
 765                         if(l >= 3)
 766                                 return 0;
 767                 } else {
 768                         /* TUR succeeded */
 769                         break;
 770                 }
 771         }
 772
 773         result = spi_execute(sdev, spi_read_buffer_descriptor,
 774                              DMA_FROM_DEVICE, buffer, 4, NULL);
 775
 776         if (result)
 777                 /* Device has no echo buffer */
 778                 return 0;
 779
 780         return buffer[3] + ((buffer[2] & 0x1f) << 8);
 781 }
 782
 783 static void
 784 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 785 {
 786         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 787         struct scsi_target *starget = sdev->sdev_target;
 788         struct Scsi_Host *shost = sdev->host;
 789         int len = sdev->inquiry_len;
 790         /* first set us up for narrow async */
 791         DV_SET(offset, 0);
 792         DV_SET(width, 0);
 793
 794         if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
 795             != SPI_COMPARE_SUCCESS) {
 796                 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
 797                 /* FIXME: should probably offline the device here? */
 798                 return;
 799         }
 800
 801         /* test width */
 802         if (i->f->set_width && spi_max_width(starget) &&
 803             scsi_device_wide(sdev)) {
 804                 i->f->set_width(starget, 1);
 805
 806                 if (spi_dv_device_compare_inquiry(sdev, buffer,
 807                                                    buffer + len,
 808                                                    DV_LOOPS)
 809                     != SPI_COMPARE_SUCCESS) {
 810                         starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
 811                         i->f->set_width(starget, 0);
 812                 }
 813         }
 814
 815         if (!i->f->set_period)
 816                 return;
 817
 818         /* device can't handle synchronous */
 819         if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
 820                 return;
 821
 822         /* len == -1 is the signal that we need to ascertain the
 823          * presence of an echo buffer before trying to use it.  len ==
 824          * 0 means we don't have an echo buffer */
 825         len = -1;
 826
 827  retry:
 828
 829         /* now set up to the maximum */
 830         DV_SET(offset, spi_max_offset(starget));
 831         DV_SET(period, spi_min_period(starget));
 832         /* try QAS requests; this should be harmless to set if the
 833          * target supports it */
 834         if (scsi_device_qas(sdev)) {
 835                 DV_SET(qas, 1);
 836         } else {
 837                 DV_SET(qas, 0);
 838         }
 839
 840         if (scsi_device_ius(sdev) && spi_min_period(starget) < 9) {
 841                 /* This u320 (or u640). Set IU transfers */
 842                 DV_SET(iu, 1);
 843                 /* Then set the optional parameters */
 844                 DV_SET(rd_strm, 1);
 845                 DV_SET(wr_flow, 1);
 846                 DV_SET(rti, 1);
 847                 if (spi_min_period(starget) == 8)
 848                         DV_SET(pcomp_en, 1);
 849         } else {
 850                 DV_SET(iu, 0);
 851         }
 852
 853         /* now that we've done all this, actually check the bus
 854          * signal type (if known).  Some devices are stupid on
 855          * a SE bus and still claim they can try LVD only settings */
 856         if (i->f->get_signalling)
 857                 i->f->get_signalling(shost);
 858         if (spi_signalling(shost) == SPI_SIGNAL_SE ||
 859             spi_signalling(shost) == SPI_SIGNAL_HVD ||
 860             !scsi_device_dt(sdev)) {
 861                 DV_SET(dt, 0);
 862         } else {
 863                 DV_SET(dt, 1);
 864         }
 865         /* Do the read only INQUIRY tests */
 866         spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
 867                        spi_dv_device_compare_inquiry);
 868         /* See if we actually managed to negotiate and sustain DT */
 869         if (i->f->get_dt)
 870                 i->f->get_dt(starget);
 871
 872         /* see if the device has an echo buffer.  If it does we can do
 873          * the SPI pattern write tests.  Because of some broken
 874          * devices, we *only* try this on a device that has actually
 875          * negotiated DT */
 876
 877         if (len == -1 && spi_dt(starget))
 878                 len = spi_dv_device_get_echo_buffer(sdev, buffer);
 879
 880         if (len <= 0) {
 881                 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
 882                 return;
 883         }
 884
 885         if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
 886                 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
 887                 len = SPI_MAX_ECHO_BUFFER_SIZE;
 888         }
 889
 890         if (spi_dv_retrain(sdev, buffer, buffer + len,
 891                            spi_dv_device_echo_buffer)
 892             == SPI_COMPARE_SKIP_TEST) {
 893                 /* OK, the stupid drive can't do a write echo buffer
 894                  * test after all, fall back to the read tests */
 895                 len = 0;
 896                 goto retry;
 897         }
 898 }
 899
 900
 901 /**     spi_dv_device - Do Domain Validation on the device
 902  *      @sdev:          scsi device to validate
 903  *
 904  *      Performs the domain validation on the given device in the
 905  *      current execution thread.  Since DV operations may sleep,
 906  *      the current thread must have user context.  Also no SCSI
 907  *      related locks that would deadlock I/O issued by the DV may
 908  *      be held.
 909  */
 910 void
 911 spi_dv_device(struct scsi_device *sdev)
 912 {
 913         struct scsi_target *starget = sdev->sdev_target;
 914         u8 *buffer;
 915         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
 916
 917         if (unlikely(scsi_device_get(sdev)))
 918                 return;
 919
 920         if (unlikely(spi_dv_in_progress(starget)))
 921                 return;
 922         spi_dv_in_progress(starget) = 1;
 923
 924         buffer = kzalloc(len, GFP_KERNEL);
 925
 926         if (unlikely(!buffer))
 927                 goto out_put;
 928
 929         /* We need to verify that the actual device will quiesce; the
 930          * later target quiesce is just a nice to have */
 931         if (unlikely(scsi_device_quiesce(sdev)))
 932                 goto out_free;
 933
 934         scsi_target_quiesce(starget);
 935
 936         spi_dv_pending(starget) = 1;
 937         mutex_lock(&spi_dv_mutex(starget));
 938
 939         starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
 940
 941         spi_dv_device_internal(sdev, buffer);
 942
 943         starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
 944
 945         mutex_unlock(&spi_dv_mutex(starget));
 946         spi_dv_pending(starget) = 0;
 947
 948         scsi_target_resume(starget);
 949
 950         spi_initial_dv(starget) = 1;
 951
 952  out_free:
 953         kfree(buffer);
 954  out_put:
 955         spi_dv_in_progress(starget) = 0;
 956         scsi_device_put(sdev);
 957 }
 958 EXPORT_SYMBOL(spi_dv_device);
 959
 960 struct work_queue_wrapper {
 961         struct work_struct      work;
 962         struct scsi_device      *sdev;
 963 };
 964
 965 static void
 966 spi_dv_device_work_wrapper(struct work_struct *work)
 967 {
 968         struct work_queue_wrapper *wqw =
 969                 container_of(work, struct work_queue_wrapper, work);
 970         struct scsi_device *sdev = wqw->sdev;
 971
 972         kfree(wqw);
 973         spi_dv_device(sdev);
 974         spi_dv_pending(sdev->sdev_target) = 0;
 975         scsi_device_put(sdev);
 976 }
 977
 978
 979 /**
 980  *      spi_schedule_dv_device - schedule domain validation to occur on the device
 981  *      @sdev:  The device to validate
 982  *
 983  *      Identical to spi_dv_device() above, except that the DV will be
 984  *      scheduled to occur in a workqueue later.  All memory allocations
 985  *      are atomic, so may be called from any context including those holding
 986  *      SCSI locks.
 987  */
 988 void
 989 spi_schedule_dv_device(struct scsi_device *sdev)
 990 {
 991         struct work_queue_wrapper *wqw =
 992                 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
 993
 994         if (unlikely(!wqw))
 995                 return;
 996
 997         if (unlikely(spi_dv_pending(sdev->sdev_target))) {
 998                 kfree(wqw);
 999                 return;
1000         }
1001         /* Set pending early (dv_device doesn't check it, only sets it) */
1002         spi_dv_pending(sdev->sdev_target) = 1;
1003         if (unlikely(scsi_device_get(sdev))) {
1004                 kfree(wqw);
1005                 spi_dv_pending(sdev->sdev_target) = 0;
1006                 return;
1007         }
1008
1009         INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1010         wqw->sdev = sdev;
1011
1012         schedule_work(&wqw->work);
1013 }
1014 EXPORT_SYMBOL(spi_schedule_dv_device);
1015
1016 /**
1017  * spi_display_xfer_agreement - Print the current target transfer agreement
1018  * @starget: The target for which to display the agreement
1019  *
1020  * Each SPI port is required to maintain a transfer agreement for each
1021  * other port on the bus.  This function prints a one-line summary of
1022  * the current agreement; more detailed information is available in sysfs.
1023  */
1024 void spi_display_xfer_agreement(struct scsi_target *starget)
1025 {
1026         struct spi_transport_attrs *tp;
1027         tp = (struct spi_transport_attrs *)&starget->starget_data;
1028
1029         if (tp->offset > 0 && tp->period > 0) {
1030                 unsigned int picosec, kb100;
1031                 char *scsi = "FAST-?";
1032                 char tmp[8];
1033
1034                 if (tp->period <= SPI_STATIC_PPR) {
1035                         picosec = ppr_to_ps[tp->period];
1036                         switch (tp->period) {
1037                                 case  7: scsi = "FAST-320"; break;
1038                                 case  8: scsi = "FAST-160"; break;
1039                                 case  9: scsi = "FAST-80"; break;
1040                                 case 10:
1041                                 case 11: scsi = "FAST-40"; break;
1042                                 case 12: scsi = "FAST-20"; break;
1043                         }
1044                 } else {
1045                         picosec = tp->period * 4000;
1046                         if (tp->period < 25)
1047                                 scsi = "FAST-20";
1048                         else if (tp->period < 50)
1049                                 scsi = "FAST-10";
1050                         else
1051                                 scsi = "FAST-5";
1052                 }
1053
1054                 kb100 = (10000000 + picosec / 2) / picosec;
1055                 if (tp->width)
1056                         kb100 *= 2;
1057                 sprint_frac(tmp, picosec, 1000);
1058
1059                 dev_info(&starget->dev,
1060                          "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1061                          scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1062                          tp->dt ? "DT" : "ST",
1063                          tp->iu ? " IU" : "",
1064                          tp->qas  ? " QAS" : "",
1065                          tp->rd_strm ? " RDSTRM" : "",
1066                          tp->rti ? " RTI" : "",
1067                          tp->wr_flow ? " WRFLOW" : "",
1068                          tp->pcomp_en ? " PCOMP" : "",
1069                          tp->hold_mcs ? " HMCS" : "",
1070                          tmp, tp->offset);
1071         } else {
1072                 dev_info(&starget->dev, "%sasynchronous\n",
1073                                 tp->width ? "wide " : "");
1074         }
1075 }
1076 EXPORT_SYMBOL(spi_display_xfer_agreement);
1077
1078 int spi_populate_width_msg(unsigned char *msg, int width)
1079 {
1080         msg[0] = EXTENDED_MESSAGE;
1081         msg[1] = 2;
1082         msg[2] = EXTENDED_WDTR;
1083         msg[3] = width;
1084         return 4;
1085 }
1086 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1087
1088 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1089 {
1090         msg[0] = EXTENDED_MESSAGE;
1091         msg[1] = 3;
1092         msg[2] = EXTENDED_SDTR;
1093         msg[3] = period;
1094         msg[4] = offset;
1095         return 5;
1096 }
1097 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1098
1099 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1100                 int width, int options)
1101 {
1102         msg[0] = EXTENDED_MESSAGE;
1103         msg[1] = 6;
1104         msg[2] = EXTENDED_PPR;
1105         msg[3] = period;
1106         msg[4] = 0;
1107         msg[5] = offset;
1108         msg[6] = width;
1109         msg[7] = options;
1110         return 8;
1111 }
1112 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1113
1114 #ifdef CONFIG_SCSI_CONSTANTS
1115 static const char * const one_byte_msgs[] = {
1116 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1117 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1118 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1119 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1120 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1121 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1122 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1123 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1124 };
1125
1126 static const char * const two_byte_msgs[] = {
1127 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1128 /* 0x23 */ "Ignore Wide Residue", "ACA"
1129 };
1130
1131 static const char * const extended_msgs[] = {
1132 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1133 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1134 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1135 };
1136
1137 static void print_nego(const unsigned char *msg, int per, int off, int width)
1138 {
1139         if (per) {
1140                 char buf[20];
1141                 period_to_str(buf, msg[per]);
1142                 printk("period = %s ns ", buf);
1143         }
1144
1145         if (off)
1146                 printk("offset = %d ", msg[off]);
1147         if (width)
1148                 printk("width = %d ", 8 << msg[width]);
1149 }
1150
1151 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1152 {
1153         int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1154                         msg[msb+3];
1155         printk("%s = %d ", desc, ptr);
1156 }
1157
1158 int spi_print_msg(const unsigned char *msg)
1159 {
1160         int len = 1, i;
1161         if (msg[0] == EXTENDED_MESSAGE) {
1162                 len = 2 + msg[1];
1163                 if (len == 2)
1164                         len += 256;
1165                 if (msg[2] < ARRAY_SIZE(extended_msgs))
1166                         printk ("%s ", extended_msgs[msg[2]]);
1167                 else
1168                         printk ("Extended Message, reserved code (0x%02x) ",
1169                                 (int) msg[2]);
1170                 switch (msg[2]) {
1171                 case EXTENDED_MODIFY_DATA_POINTER:
1172                         print_ptr(msg, 3, "pointer");
1173                         break;
1174                 case EXTENDED_SDTR:
1175                         print_nego(msg, 3, 4, 0);
1176                         break;
1177                 case EXTENDED_WDTR:
1178                         print_nego(msg, 0, 0, 3);
1179                         break;
1180                 case EXTENDED_PPR:
1181                         print_nego(msg, 3, 5, 6);
1182                         break;
1183                 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1184                         print_ptr(msg, 3, "out");
1185                         print_ptr(msg, 7, "in");
1186                         break;
1187                 default:
1188                 for (i = 2; i < len; ++i)
1189                         printk("%02x ", msg[i]);
1190                 }
1191         /* Identify */
1192         } else if (msg[0] & 0x80) {
1193                 printk("Identify disconnect %sallowed %s %d ",
1194                         (msg[0] & 0x40) ? "" : "not ",
1195                         (msg[0] & 0x20) ? "target routine" : "lun",
1196                         msg[0] & 0x7);
1197         /* Normal One byte */
1198         } else if (msg[0] < 0x1f) {
1199                 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1200                         printk("%s ", one_byte_msgs[msg[0]]);
1201                 else
1202                         printk("reserved (%02x) ", msg[0]);
1203         } else if (msg[0] == 0x55) {
1204                 printk("QAS Request ");
1205         /* Two byte */
1206         } else if (msg[0] <= 0x2f) {
1207                 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1208                         printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1209                                 msg[1]);
1210                 else
1211                         printk("reserved two byte (%02x %02x) ",
1212                                 msg[0], msg[1]);
1213                 len = 2;
1214         } else
1215                 printk("reserved ");
1216         return len;
1217 }
1218 EXPORT_SYMBOL(spi_print_msg);
1219
1220 #else  /* ifndef CONFIG_SCSI_CONSTANTS */
1221
1222 int spi_print_msg(const unsigned char *msg)
1223 {
1224         int len = 1, i;
1225
1226         if (msg[0] == EXTENDED_MESSAGE) {
1227                 len = 2 + msg[1];
1228                 if (len == 2)
1229                         len += 256;
1230                 for (i = 0; i < len; ++i)
1231                         printk("%02x ", msg[i]);
1232         /* Identify */
1233         } else if (msg[0] & 0x80) {
1234                 printk("%02x ", msg[0]);
1235         /* Normal One byte */
1236         } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1237                 printk("%02x ", msg[0]);
1238         /* Two byte */
1239         } else if (msg[0] <= 0x2f) {
1240                 printk("%02x %02x", msg[0], msg[1]);
1241                 len = 2;
1242         } else
1243                 printk("%02x ", msg[0]);
1244         return len;
1245 }
1246 EXPORT_SYMBOL(spi_print_msg);
1247 #endif /* ! CONFIG_SCSI_CONSTANTS */
1248
1249 #define SETUP_ATTRIBUTE(field)                                          \
1250         i->private_attrs[count] = class_device_attr_##field;            \
1251         if (!i->f->set_##field) {                                       \
1252                 i->private_attrs[count].attr.mode = S_IRUGO;            \
1253                 i->private_attrs[count].store = NULL;                   \
1254         }                                                               \
1255         i->attrs[count] = &i->private_attrs[count];                     \
1256         if (i->f->show_##field)                                         \
1257                 count++
1258
1259 #define SETUP_RELATED_ATTRIBUTE(field, rel_field)                       \
1260         i->private_attrs[count] = class_device_attr_##field;            \
1261         if (!i->f->set_##rel_field) {                                   \
1262                 i->private_attrs[count].attr.mode = S_IRUGO;            \
1263                 i->private_attrs[count].store = NULL;                   \
1264         }                                                               \
1265         i->attrs[count] = &i->private_attrs[count];                     \
1266         if (i->f->show_##rel_field)                                     \
1267                 count++
1268
1269 #define SETUP_HOST_ATTRIBUTE(field)                                     \
1270         i->private_host_attrs[count] = class_device_attr_##field;       \
1271         if (!i->f->set_##field) {                                       \
1272                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1273                 i->private_host_attrs[count].store = NULL;              \
1274         }                                                               \
1275         i->host_attrs[count] = &i->private_host_attrs[count];           \
1276         count++
1277
1278 static int spi_device_match(struct attribute_container *cont,
1279                             struct device *dev)
1280 {
1281         struct scsi_device *sdev;
1282         struct Scsi_Host *shost;
1283         struct spi_internal *i;
1284
1285         if (!scsi_is_sdev_device(dev))
1286                 return 0;
1287
1288         sdev = to_scsi_device(dev);
1289         shost = sdev->host;
1290         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1291             != &spi_host_class.class)
1292                 return 0;
1293         /* Note: this class has no device attributes, so it has
1294          * no per-HBA allocation and thus we don't need to distinguish
1295          * the attribute containers for the device */
1296         i = to_spi_internal(shost->transportt);
1297         if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1298                 return 0;
1299         return 1;
1300 }
1301
1302 static int spi_target_match(struct attribute_container *cont,
1303                             struct device *dev)
1304 {
1305         struct Scsi_Host *shost;
1306         struct scsi_target *starget;
1307         struct spi_internal *i;
1308
1309         if (!scsi_is_target_device(dev))
1310                 return 0;
1311
1312         shost = dev_to_shost(dev->parent);
1313         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1314             != &spi_host_class.class)
1315                 return 0;
1316
1317         i = to_spi_internal(shost->transportt);
1318         starget = to_scsi_target(dev);
1319
1320         if (i->f->deny_binding && i->f->deny_binding(starget))
1321                 return 0;
1322
1323         return &i->t.target_attrs.ac == cont;
1324 }
1325
1326 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1327                                "spi_transport",
1328                                spi_setup_transport_attrs,
1329                                NULL,
1330                                NULL);
1331
1332 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1333                                     spi_device_match,
1334                                     spi_device_configure);
1335
1336 struct scsi_transport_template *
1337 spi_attach_transport(struct spi_function_template *ft)
1338 {
1339         int count = 0;
1340         struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1341                                          GFP_KERNEL);
1342
1343         if (unlikely(!i))
1344                 return NULL;
1345
1346         i->t.target_attrs.ac.class = &spi_transport_class.class;
1347         i->t.target_attrs.ac.attrs = &i->attrs[0];
1348         i->t.target_attrs.ac.match = spi_target_match;
1349         transport_container_register(&i->t.target_attrs);
1350         i->t.target_size = sizeof(struct spi_transport_attrs);
1351         i->t.host_attrs.ac.class = &spi_host_class.class;
1352         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1353         i->t.host_attrs.ac.match = spi_host_match;
1354         transport_container_register(&i->t.host_attrs);
1355         i->t.host_size = sizeof(struct spi_host_attrs);
1356         i->f = ft;
1357
1358         SETUP_ATTRIBUTE(period);
1359         SETUP_RELATED_ATTRIBUTE(min_period, period);
1360         SETUP_ATTRIBUTE(offset);
1361         SETUP_RELATED_ATTRIBUTE(max_offset, offset);
1362         SETUP_ATTRIBUTE(width);
1363         SETUP_RELATED_ATTRIBUTE(max_width, width);
1364         SETUP_ATTRIBUTE(iu);
1365         SETUP_ATTRIBUTE(dt);
1366         SETUP_ATTRIBUTE(qas);
1367         SETUP_ATTRIBUTE(wr_flow);
1368         SETUP_ATTRIBUTE(rd_strm);
1369         SETUP_ATTRIBUTE(rti);
1370         SETUP_ATTRIBUTE(pcomp_en);
1371         SETUP_ATTRIBUTE(hold_mcs);
1372
1373         /* if you add an attribute but forget to increase SPI_NUM_ATTRS
1374          * this bug will trigger */
1375         BUG_ON(count > SPI_NUM_ATTRS);
1376
1377         i->attrs[count++] = &class_device_attr_revalidate;
1378
1379         i->attrs[count] = NULL;
1380
1381         count = 0;
1382         SETUP_HOST_ATTRIBUTE(signalling);
1383
1384         BUG_ON(count > SPI_HOST_ATTRS);
1385
1386         i->host_attrs[count] = NULL;
1387
1388         return &i->t;
1389 }
1390 EXPORT_SYMBOL(spi_attach_transport);
1391
1392 void spi_release_transport(struct scsi_transport_template *t)
1393 {
1394         struct spi_internal *i = to_spi_internal(t);
1395
1396         transport_container_unregister(&i->t.target_attrs);
1397         transport_container_unregister(&i->t.host_attrs);
1398
1399         kfree(i);
1400 }
1401 EXPORT_SYMBOL(spi_release_transport);
1402
1403 static __init int spi_transport_init(void)
1404 {
1405         int error = transport_class_register(&spi_transport_class);
1406         if (error)
1407                 return error;
1408         error = anon_transport_class_register(&spi_device_class);
1409         return transport_class_register(&spi_host_class);
1410 }
1411
1412 static void __exit spi_transport_exit(void)
1413 {
1414         transport_class_unregister(&spi_transport_class);
1415         anon_transport_class_unregister(&spi_device_class);
1416         transport_class_unregister(&spi_host_class);
1417 }
1418
1419 MODULE_AUTHOR("Martin Hicks");
1420 MODULE_DESCRIPTION("SPI Transport Attributes");
1421 MODULE_LICENSE("GPL");
1422
1423 module_init(spi_transport_init);
1424 module_exit(spi_transport_exit);